Neptune R450 MC, Installation And Maintenance Manual

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Product Description
8 R450 Mini Collector Installation and Maintenance Guide
Problems can occur from a number of sources. Some common problems
include the following:
• Improper installation, for example, loose connectors. Refer to
“Feed Line and Antenna Recommendations” on page 54 in
Appendix A to confirm the correct installation procedures.
• Local cable systems having leaks in the cables and amplifiers can
degrade the performance of the R450 System.
• Local businesses and factories can have equipment that raises the
ambient noise level, reducing the ability of the R450 MC to hear
MIUs.
• Local residences and businesses can have equipment that interferes
with the R450 System.
Site surveys often find these problems but cannot detect intermittent,
factory shift related, or other time specific sources of interference.
Being in close proximity to a high power commercial broadcast antenna
produces a unique set of problems. Loose or badly corroded hardware
on or near the site can cause signals from the R450 MC or other
transmitters near the site to combine with the broadcast signal and
produce interfering signals. Incorrectly installed antennas and feed lines
can also cause similar problems. The R450 MC and other local
transmitters themselves can also be a source of re-radiated interference.
Additional equipment that your installer can recommend can help
control these issues.
Terrain and the types of buildings in the area can affect the performance
of the R450 System. Hilly or rolling terrain as well as tall buildings can
make it difficult to receive even local MIUs. Placement of the MIUs
(wall mount and pit style) can be critical in some areas. Additional R450
MCs that can supplement the problem areas can be the best solution in
these situations.
Maintaining the Performance of the R450 System
The first major activity is to be sure that you properly install all the
R450 MIUs so that the R450 System can reliably receive their
transmissions.
The troubleshooting section of this guide includes recommendations on
how to verify that the R450 MC and antenna system are performing up
to specification.
Storm activity can degrade the performance of the R450 MC. If this
happens, the lightning arrestors should be checked and replaced if
defective.
Running the surveys again using the radio receiver can identify new
sources of interference. Problems related to specific time windows
should have the surveys performed during those time periods.
You must provide this appendix to antenna contractors prior to
installation. Failure to follow these procedures can result in poor
system performance.